Description

Description. Semi-deciduous climbing shrubs. Stems terete. Petioles 1 - 4 cm long, densely pubescence; laminas lanceolate to hastate, 8 - 24.5 x 1.2 - 5.5 cm, adaxially glabrous or sparsely pubescence along medial vein, abaxially densely pubescence, base auriculate to cordate, margin entire, apex acute; veins palmate, 2 - 3 pairs from base, lateral veins 6 - 15 - paired. Cymes on old woody stems or axillary, 1 - 2 - flowered, in clusters of 1 to numerous; pedicels 5 - 7 cm long, sparsely pubescence; bractlets 1 or 2, ovate-lanceolate, 3 - 5 mm long, adaxially glabrous, abaxially densely brown villous. Calyx tube geniculately curved, yellowish-white with distinct purple stripe, abaxially subglabrous or sparsely villous; basal tuber 2.5 - 3.5 cm long, inside black purple at base, white mix with more or less reddish-violet above base, upper tube 2.5 - 3.5 cm long, inside white mix with reddish-violet, limb cylindric, symmetric, 3.3 - 4.7 cm long, straight extended from upper tube and parallel to it, inside pinkish or ochre, deeply 3 - lobed, lobes ovate-deltoid, 1.6 - 2.4 cm long; throat ca. 7 mm in diam. Anthers 6, oblong, ca. 2 mm long, adnate in 3 pairs to base of gynostemium, opposite to lobes. Gynostemium ca. 3.5 mm long, 3 - lobed. Ovary terete, 15 - 25 mm long, densely brown villous. Fruit stem purple red, ca. 6.5 cm long, sparsely puberulous. Capsule narrowly obovate-elliptic, distinctly 6 - angled, nearly glabrous, ca. 10.5 x 2.5 cm (ca. 8.5 x 2 cm in dry specimens). Seeds ovate-elliptic, 5 - 5.5 x 3.5 - 4 mm, not winged, the adaxial surface deeply concave and the abaxial surface convex, wrinkled, both surfaces glabrous.

Common Names

Taxonomic Hierarchy

Kingdom: Plantae

Phylum: Tracheophyta

Class: Magnoliopsida

Order: Piperales

Family: Aristolochiaceae

Genus: Isotrema

Species: Aristolochia yangii X.X.Zhu & J.S.Ma